Mechanical calendar



Ap Q A. K. HLGEQQIUNDSOHN a 5,

MECHANICAL CALENDAR Filed Dec.- 16 1932 1O Sheets-Sheet 1 Y 'Apri] l935.- A. KJ'H. GERMUNDSON 1,996,701

MECHANICAL CALENDAR Filed Dec; 16. 1932 10 Sheets-Sheet 2 p 1 5 f A.-

G-ERMUNDSON 1,996,701

MECHANICAL CALENDAR Filed Dec. 16, 1932 1 Sheets-Sheet 3 April 2, 1935.

Filed Dec. 16, 1932 10 Sheets-Sheet 4 April 2,1935. A. K. H. GER MUNDSON I 1,996,701

I MECHANICAL CALENDAR F iled Dec; 16, 1952 10 Sheets-Sheet 5 April A. K. H. GERMUNDSON MECHANICAL CALENDAR Filed Dec. 16, 1932 10 Sheets-Sheet 6 APril 2, 1935- I A. K. H. GERMUNDSON 1,996,701

MECHANICAL CALEfiDAR Filed Dec. 16, 1952 10 Sheets-Sheet 7 April 2, 1935. A. K. H. VGERMUNDHS'ONI MECHANICAL CALEEDAR 10 Sheets-Sheet 8 Filed Dec. 16, 1932 April 2,1935. K.H.G ERMUND$QN ,v 13%,7M F

MECHANICAL CALENDAR Filed Dec. 16, 1932 lO Sheets-Sheet 9 w & I r v 1/ v 1/10, III/1111a&/////////////Ill/I/Il/I/I/l/l/II/Ill/a ll IIIIIIIII'I' l IVllhI IIIIIIIIIII April 1935- A. K. H. GEVRMUNDSON 1,996,701

MECHANICAL CALENDAR Filed Dec 16. 1952' 10 Sheets-Sheet 1o Patented Apr. Z 1935 V g 1 I UNITED STATES PnTENrjoFFiCE am Herbert Germundson, Stockholm,

Sweden, assignor .to Akticbolaget I Sparnret, Stockholm. Sweden, a company of Sweden Application December 16, 1932, Serial No. 647,660 t In Sweden December 22, 1931 Y Y .24 Claims. (01. 40-112 The present invention relates to a,v mechanical Figure 9 a section through-the line. 8. I in Figcalendar that indicates the single. days of the ure 8. week, date, month and year and is arranged to Figure .10 shows the feeding mechanism embe driven during a long course of years, the calployed for the displacement or the month plate.

endar mechanism being provided withmembers as well as portions of the month. date and day it which correct automatically for leap-years. plates, and Figure 11 the sameparts insection The invention relates, moreover, to driving through the line H, II in Figure 10. meanssuitable for driving the calendar andbe- Fi res 12 to 16 refer to IBOthBr emb diment ing controlled for instance .by ordinary clock- 01 themechanical calendar.

works. r Figure 12 showsa view of .the calendar. the lo The calendar 'comprisesiour. coaxially iourcover plate situated on the front side being renalled members cooperating with or acting as moved. Y bearers oithe plates of the calendar which-are Figure 120 shows a view of h alendartaken marked with a single series of names or. ordinal from the rear of Figure 12, with the. rear cover Y numbers for the single days of the week, date, plateremoved. .Y 1

month and year, respectively. Thedateindicat- Figure 13 is a plan view of the same embodiingmember that is arranged to step on, in the ment. s 9 1 i Y course or the month, one" step in twenty-four Figure 14 shows the calendar mechanism situhours, is on a change of month automatically ated behind the calendar-plates and Figure 15 1 reset to its initial position by means of a for inis a horizontal section taken on line I5, I! in 20 stance spring-loaded, mechanism. Said resetting Figure 14. Y i mechanism is arranged to be released under the Figure 16 shows the backside of the calendar. 7 control of a releasing member controlled by the Figure 17 shows a further embodiment of the months indicating member, for example'a pivmechanism employed for the displacement of oted, in various positionsadjustable arm' which the month plate and fertile re t rin 0f the 25 through its position determines the proper numdate plate. a ber of feeding steps for the date indicating mem- Figures 17a and 17b show details of the lastber between two consecutive displacements oi! the mentioned mechanism. a 4 I months indicating member, the-releasing 'mem- Figure 18 is a sectionthrough the line ll, II 30, her being inthatway set by means of. the months -in Figure 17. a

indicating member into four positionslcorre- Figures 19 to 24 show an improved driving sponding to the different number of days of themechanism for the calendar, said mechanism months. L being controlled by a clockwork: The invention will be more closely described Figure 19 is a front view 0! portions of said. 35. with reference to theaccompanying drawings, vcontrolled driving m cha v which illustrate, by' way of examples, two em-Y Figure 20 shows-a brake and stoppingjarrange- Y bodiments of the mechanical calendar according ment-tor the driving mechanism shownjn Fig- -to the invention. 1 ure 19. 1 r 1 V j Figures 1 to 11 show one embodiment of the Figure 21 is'a partial plan view of the driving calendar. i mechanism and the stopping arrangement shown Figure 1 shows schematically the calendar'in "in Figures 19 and 20, respectively.

combination with a clockwork. Figure 22 shows how the driving mechanismis' Figure 2 shows a view of the calendar, the connected to the driving spring of the clockwork. Y

cover plate on the front side of the mechanism Figure 23 is a vertical section through the line f being left out, and Figure 3 the same embodi 23, 23 in Figures 19, 20 and 22. V

ment in section through the line 3,' 3 in Fig- Figure 24 is a side view 01' the members shown ure2. Y Y inFigure2l. Y b

Figure 4 is a detail whichshows the month Figure 25 shows another embodiment otadrivand year plates, and Figure 5. shows the same ing mechanism controlled by a clockwork. Y I 50 plates in section through the line 5, 5 in Fig-Y Y Y Figure 26 is a horizontal section through the uresi., r Y line 26,26inFigure25. Y

Figures6 and '7 show a detail oithe driving Figure 2'7 is a vertical section-through the line means used in combination with a clockwork. 21, Thin Figure 25. Y so Figure 8 shows a view of the date plate and Figure 28 is a section through the line 28, 28

M11 on another circle having a somewhat shortin Figure 25, the '24-hour-hand being replaced by a rotatable disc. I

Figure 29'shows on a reduced scale the last- ,mentioned disc.

Figure 30 shows, likewise on a reduced scale, a modified embodiment of said disc aswell as a displacement arrangement intended-for the-same.

Figure 31 is a plan view of the members shown in Figure 30.

In Figures 1 to 11, a calendar II is arranged to be driven from a clock I, Figure 1, by means of a transmission gear consisting of acog-wheel'Z rectly journalled on the pin l6. 7

, The year plate'consistsof a toothed disc 20 cog-wheel 3. The rod! which is connected to a downwards acting draw spring I0, is at its lower end by means of a bolt 3|, Figure 3, connected to a driving arm 30 of the mechanical calendar I I, to which arm on the'rotation of thecog-wheel 3 in a counterclockwise direction thus is imparted a lift and drop motion, a 1 Y For the purpose of setting the calendar without actuating the clock, the cog-wheel 3 is not rigidly secured to the eccentric but provided with a catch-spring 9, which engages a-notch on a disc I3, said disc being formed on the axle spindle of the cog-wheel, to whiclispindle the eccentric is attached. Said spindle is, moreover, provided with awheel l3' 'by means of which the eccentric 4 may thus be rotated'independently of the cog-wheel 3.

The calendarwork is in conformity with ordi nary clockworks mounted between'two plates.

The one of said plates that is situated on the front side, is provided with a-suitably formed window -ll which frames the plate markings necessary for the reading of the calendar;

In Figures2 .and 3, the rear'mounting plate of the calendar is'denoted l5, into which plate is threadeda-cenBre-pin l6.g The calendar is provided with four ring-shapedplates indicating the single days of the week, date, month and year, and the three --last-mentioned of which *are diwhich is provided with twelve ratchet teeth and twelve numberv groups corresponding. to, said ratchet teeth and consisting of the last two numbers of consecutive years. To the back side of the year plate is welded a cam disc 29, Figure 4. provided with three cams and twelve evenly distributed notches, every fourth notch being 10- cated on one of the three cams of the disc.

The month plate i9 is divided into twelve fields of equal size, each'of which is marked with a month-name." The month-names are disposed in chronological order. Said month plate is carried by a disc 22 which is formed as an escapement wheel having twelve escapement or month pinsMr-Mi: which are situated at radial distances corresponding "to the different number of days of'the months. The radial distance of the pin M1 corresponds'to thenumber or days of the month of January, M2 to that of the month of February, etc. The pins M1, M3, M5,

I M1, Ms, M1o, and M12 are-thus situated on one and the same'circle and the pins M4, M0, M9, and

' and 29 days.

The bigger cog-wheelg 3, which makes one er radius. The pin M2 is movable, so that it can be set into two positions corresponding. to 38 The pins M1, M's-M12 are at the same time arranged to support the month plate 19 in such a manner that an intervening space is formed between the monthplate IQ and the month disc 22, in which space an arm 24 can reach the month pins.

' The date plate consists. of an annular raised portion IS on a disc 21. .Said date plate is divided into thirty-two fields of equal size which are marked with the ordinal numbers I to 3| in succession in such a manner that each field contains an ordinal number, except the field betweenthe numbers 1 and 31, which field has 7 no marking. The annular portion I8 is in radial direction outwards and inwards bordered by concentrical cylindrical surfaces, of which the inner surface encircles the month disc 22. The rear side of the disc 2| is around its centre formed as a spring'casing 32 enclosing a spiral spring 28, which casing holds the outer. end of said spring, whereas the inner end of the spring, by means of a hook or the like, is secured to the centre-pin I6. The periphery of the date disc is divided into 32 ratchet teeth, thus one tooth for each date field.

The day plate is formed as a flanged ring l1, which with its flange is slidably mounted round the outer cylindrical surface of the annular portion 18 of the date disc 2|,the flange of the ring being-directed towards the date disc so that an intervening space is formed between the day ringand the peripheral portion of the date disc.

The day plate is divided into seven fields. of equal size which are marked with the names of the days of the-week in succession. The day ring is at its periphery provided with seven ratchet teeth I corresponding to the day fields, which teeth'extend in radial direction a distance beyond the teeth of the date disc, whereas the bottom of the tooth gaps in both cases is located at" the same distance from the common centre of the plates. v

The centre-pin I6 is by means of a screw at- I tached to one end of a strut arm di, the other end of which is secured by screws to a pin 42 inserted. in the mounting plate l5. The strut arm holds the locking device of the year plate, which device will be describedin connection with the function of the year plate.

7 Likewise, :the structure and function of the arm shown at the bottom of Figure 2 anddenoted 24, will be elucidated in the description of the function of the month plate.-

The driving arm 30 of the calendar, which arm is provided with a pawl 33, is shown in Figure 2 pin I 6. The'pawl 33 is by means of a spring 31 kept in engagement with the day ring I! as well as with'the date'disc 2|. The bolt 3| secured to the driving arm 30 moves during the lift and drop motion of the driving arm in a slot 21 provided in the plate I 5. Furthest to the right on the piste it a guiding strip 25 is arranged to here ring when the guide shoulder 36 is held against. the cylindrical surface 31. It is shown by the fig ure that the pawl 33 from its uppermost position can be moved downwards a certain distance cor-' responding to the. tooth pitch of the date disc,

before the guide shoulder 35 of the pawl comes. into engagement with the cylindrical surface of the. guiding strip 25. During the downward motion of. the driving arm the date disc is thus fed spectively. Thesprings 52 and 54 may suitably.

one tooth or, in other words,,one date number," .whereupon the pawl 33 is in engagement onlywiththe day ring; which is led one'tooth pitch or one day by the pawl. When the day ring has beenfed one step, thedriving arm has reached its lowest position. g 5. a

In a'view to retaining the day and date plates in the positions into which they have been set, each of them is locked by means oil-a springloadedstop pawl and 53 respectively. The two pawls 50, 53, are pivoted on a bolt SI and are kept in engagement with the teeth of the day and date plates by means of springs and 54 rebe. made in one piece and be retained .by a pin inserted in the plate. l5.

Figures 10 and 11 illustrate the members which I are provided for the displacement oi, the month plate and the restoring oi the date. plate.

The arm 24 which is Iulcrumed atia pin. 23 is pressed inwards towards the, centre oi the calendarby means of a spring .65. A pin 61 .onthe arm' 24 takes up the pressure of the spring 65.

The arm 24 is at its free end provided with a claw-like. portion which-is provided partly with a notch 60 and partly with tour notches D3i-D28 disposed in steps. The. clawlike portion of the armv 24 is dimensioned in such a manner that a striker 'tappet I! inserted in theannular portion ll of the date disc engages the notch D31 when the notch 60 seizes the ones of the pins Mi-M12 which correspond with months having thirty-one days. If, on the otherhand, the calendar shows a month consisting oi 30 days, for instance the {,month of November the pin M11 is in engagement with the notch 60, the arm 24 then taking up such a position thatthe. tappet 12 engages the notch D30. Finally, the February pin M2, which according to the i'oregoingcantake up two difier- ,ent positions; sets thearm 24 in such a manner that either thenotch D28 or D29' is brought into the path 0! the tappet I2 01' the date The last-mentioned case occurswhen the year plate shows leap-years. The bearing pin 23 of the arm 24 isinserted in a plate member 66 ioumalled on the centre-pin IS, the periphericjedge portion oi! said plate member being provided with a flange I 69. This flange is arranged to raise the pawl 53 clear of the teeth of the date disc on the rotation of the plate member 66 in a clockwise direction. The central portion of the plate member 66,

which portion forms'a cover for the spring casing provided at the datedisc. is firmed with an eccentric 68, which rests against the free'endof an stormed spring 10. The other end ofsaid springis by means of a pin H, attached to the plate l5. In the position shown in Figure 10 the spring 10' presses the plate member Efiagainst a stop pin 12 which is inserted in the rear mounting plate [5. The plate member 66 can be turned ,in a clockwise direction, thespring 10 then being Pushed over the top of the eccentric 68 andthe eccentric together with the arms, 66. 24* being moved, by means of the spring 10,"in to the position marked in Figure 10 with dash-dotted lines. During this rotary motion the'arm 24 goes out of engagement with the one of the pins M1Ml2 which corresponds to themonth as set,..butts against the nextmonth pin and slips against said pin until the notch Gil comes *into" engagement with the. pin 'in question, the" flange 63 thereby pushing the pawl 53 outwardssuc'h a-distance that it goes out of engagement with the date disc.

In consequence, when the pawl 33' takes up its lowest position on a change of month, the date disc is thoroughly unblocked and is swung in a counterclockwise direction by the spiral spring 26. .The tappetfl thereby thrusts against a projection 68 on'the'clawlik'e portion or the arm 24 and brings said portion together with the system 24,66, 68 back tothe initial position.' Since the notch 60 is now in engagement with one of the month pins M1 Mi2,-'the'm0ntl1 plate is siniultaneously turned forward intoa positioncoi;re'- I, .sponding to a new month. In this positionfthe month plate is retained by rgeans of the and which is now in its turn keptin-locked position throughflthemembers 10', 63, 66,-and [2. The tappet fl rests, under the action of thespiral spring 28, against thejprojection 68. which is so dimensioned that the distance of the'pin H from the notch D31 corresponds to the width ot'two date fields. This is obvious from Figure *2. The

day plate is" marked with numbers in such a way that the ordinal number 1 is visible in the-window l4 0! the calendar when the'pin l1 rests against. the projection 58. The'day plateis, therefore,

restored every time the month plate is'displaoedf' so as to indicate anew month. i i

On the displacement of the month'plate irom the December position to the Januaryposition also the year plate is displaced.

.In Figures 4 and 5, theyear plate 23 is normally locked by'means of a pin 40 on a two-armed pawl 39. Said pawl is pivoted on ascrew'43threaded into the strut arm 4|. A'spring 43', which rests against a-pin 33 on the otherarm oi the pawl;

endeavours to'turn' the pawl in acounterclockwise direction. A- shoulder 69 on the month plate is so arranged that it comesinto engagement with the pin 36 on the displacement of the month plate from the December position to the January position and pushes said pin in the direction of the centre of the calendar, by means of which the. pin 40 is moved clear of the teeth of the year plate. In this connection itmay'be pointed'out that in a viewto a firmer locking of the month plate, the pin 36 ean cooperate with twelve notches (not shown) disposed in a suitable' man ner at the inner edge of the plate. A

Figures 4 and' 5 also illustrate'the ar-' 'rangement of the adjustableFebmary 'pin A cursor 46, which is disposed in the inonth'plate V and is slidable thereinin radial directionyisprovided with two pins 45, M2, or which the pin '46 cooperates with notches in the-cam disc 23 or the in a slot 41 in the-month plate, is located between the cam'disc "and the date disc 2|, whereby it is guided longitudinally. A spring 44 attached to the month plate keeps the pin 46 in engagement 70 year. plate. The cursor 46, which is disposed with the notches of the cam disc 29. By this means a catch action is obtained between the year and the month plate. Thus, the February pin M: follows the curve of the cam disc 28 on the turning of the month plate in relationto the year plate. The cam disc is so shaped that the,pin M:

takes up. two in radial direction determined po- I its lowest position, the, day and date plates then being fed one step or one tooth pitch each. The

.tappet I2ofthe date disc isduring the first day of the month in the initial position shown in Figure 2. When the date disc has been fed the -number of days corresponding to the indicated Imonth, the tappet l2 has arrived at one of the notchesDn Da on the arm 24. The position,

' shown in Figure 10,'of' the members of the calendar represents the position on the 30th of Jan-.

,uary, As appears, the tappet I2,is positioned one step to the right of its last position in this month. The arm 24 is in engagement with the month pin H; and thus occupies such a position that the date disc I can be fed another step so that the date number a becomes visible in the window of the calendar. At 12 o clock atthe night before the 31st of January the driving arm 30 is again month plate having arrived pushed downwards into its lowest position conveying thedate disc one step, the tappet I2 then arriving at the notch D31 whilst feeding simultaneously the day plate. At the nextimpulse on the driving arm III the tappet I2 pushes the arm 24 in a clockwise direction so that the spring II snaps over the top of the eccentric 68, the

arm system 24, 66, 68 being thereby rapidly carried forward in a clockwise direction into the position in whichthe notch engages the next month pin Ms. I During the rotation of the disc 66 in a clockwise direction, the pawl 53 is raised so as tojget clear, of the teeth of the date disc. In the meantime, also the pawl 33 of the driving arm has, by engagement with the guiding strip 25, gone out of engagement with the teeth of the date plate, on account of which the date disc, which isnow. free,.is brought, by means of the spiral spring, to make one revolution in a counter-clockwise direction. The tappet I2 now rests against the projection 58 of the clawlike portion of the arm 24 and returns the arm system 24, 66,68 to the initial position, which is determined by the stop pin 12, and simultaneously the month plate isfed to a new month. The

at the December position, the shoulder 58, which is shown in Figure .4, occupies such a position that, on the. next advancing of the month plate, it passes below the pin 28 of the two-armed lever 39, the year plate being thereby made free from the detent pin 40. By means] of the snap connection between the year and month plates, the year-plate is now fed simultaneously with the month plate and is set to a new year. 1 a

L'Ihe leap-year position of the cam disc 29 connected to the year plate is shown by Figure 2. The calendar indicates here Friday, the 1st of .of the tappet. The

of the calendar hereinbefore pin l2 of the date plate is in the initial position. The driving arm it occupies its lowest position, which indicates that .a displacement of the day and date plates has recently been performed. The month pin M: is one step to the left of thenotch 60 on the arm 24 and one step to the left of one of the cams of the'cam disc 29. 45 of the cursor 46 is broughtup on to said cam and the pin Ma sets the arm 24 into the position in which January 1932. The

the notch D29 is moved into the path feeding of the date plate can, therefore, continue only up to the date number 29, because during the displacement from the 29th to the 30th the feeding mechanism of-the month plate is released and the date plate is restored.

A second embodiment of the mechanical cal- 'endar is shown in Figures 12 to 16, said embodiment differing from theone above described in the main by a modified structure of the mechanism adapted for feeding the month plate and of the restoring mechanism of the date plate.

The calendar according to this embodiment presents, for the rest, great likenesseswith'the first embodiment and thus comprises four plates on the next month displacement, the pin which are fed step by step and are subdivided in I the same manneras the plates hereinbefore described, withthe distinction, however, that the date plate only comprises thirty-one fields of equal sizeand numbered in succession.

In Figures 12 and l3, l1 and day and the date, plate which are disposed and fed in the same way as in the embodiment above described.- Two springs 98 and 86' adapted as catch springs retain said plates in the positions into which they have been set. The month plate I9 is turned in a counterclockwise direction, whereas the year plate 20' likewise providedwith the twelve year fields is fed in a clockwise direction. I

I The guide shoulder 35 of the pawl 33 cooperates also here with the cylindrical surface n designate the e 31 on a fixed guiding strip 25 on the displacement of the day and the date plate. The pawl 33 is pivoted on a projecting bracket II which inits turn is supported by a pin I extending through an are like slot 21' coaxialwith the calendar shaft'il, said pin being welded to a driving arm 56 of the calendar. I25 designates an adjustable guiding strip which is arranged in such a manner that it in its operative position 7 forms an extension of the strip II, the pawl 23 being by thismeans during the whole feeding stroke kept out of engagement with the toothed rim of the date plate- The guiding strip I2! iscarried by a substantially vertical rod I24, which by means of slotted holes grasps two guide screws I42 threadedinto the strip 25'. By means-of this arrangement, the purpose of which will be statedin the following, the strip I25 can be set into a lower or operative position and into an upper, inoperative position. The rod I24 which.

at its lower end is provided with a foot I28 is of such a length that on the erection of the calendar on a plane supporting tablethe guiding operative position, i e. so as to get clear of the pawl 33 on the ground that the foot of the rod will then bear on the same plane as the calendar.

In Figure 14, the calendar mechanism is shown after the plates of the calendar hayebeen removed. The section in Figure 15 comprises, on the other hand, also the plates in their mounted position.

.strip I25 will be displaced upwards into the inguide shoulder 83'. A cursor 6,4,, is'slidably arv with a pawl 8|,

' spring 1 I49 is secured.

m Figure 15, the year plate is denoted w and the month plate IS. The centre-shaft SI of the calendar is rigidly secured to the year plate, a

cam disc 29 and a tooth wheel Him-which is provided with twelve teeth. Themonth plate 19' constitutes an annularraised portion on a disc 22' situated behind the year plate, said disc being rigidly secured to a sleeve 32' revolving on the shaft 6|. The rear end of said sleeve is in its turn rigidly secured to a disc 22b, the peripheric portionof which forms aring-shapedbody which inwards towards the centre-shaft is bordered by a cylindrical surface, II, which is concentrical with said shaft, and outwards by a cam surface 51, by the side of which the ring-shapedbody is provided with a ratchet drum 62 having twelve detentsa a The date plate is carried by, a disc 2| which is rigidly secured to a-rheliciform eccentric ll and a socket, which is rotatively mounted on the, shaft sleeve 32. The disc 2| is at its periphery provided with a tooth rim segment 95 which takes up. an angle corresponding to four date fields. .The day plate is, as stated in connection with the first embodiment, formed as a rim I1, the day ring, which is rotatively mounted on a cylindrical surface bordering thedate plate H outwards, that edge of said. cylindricalsurface that is turned forwards, being pressed out, to form a very thin flange ring, which retains. the

day ring inv position and forms an 'e'ifective guide for the same. The calendar plates are, as appears from Figure 15, all togetherarrangedin a common plane. v

The pivotlike rear end of shaft, il extends through thetrear mounting plate 'l'l'gof, thev calendar and forms a bearing spindlefor'the driving arm end ofsaid spindle is rigidly to a ratchet wheel I40.

The members provided for feeding the month and the year plate and forrestorlng the date plate are shown inFlgure 14. g

A feed arm 63 actuated by'ja springflflfandintended to displace the monthfplate is rotativ'ely. mounted on a bolt 26' in mount-a; l5. Said arm is at its freeend' rovided which by means or, searing; 82' I is kept in engagement with 82.; of the disc 22b, which rim istnormally locked ing plate by a catch spring 149. The lastmentioned spring 89 effecting end by means of a the feed motion is at its one pin or thelike-J! attached to 'theplate l5 and at its othe rgfend connected to a toothed rack'lrseciifed to the free end-ofthe" feed arm, said rack being laterally guided by:

ranged on the arm 68.v For the purposeof guiding the cursor a bolt 19 attached to the arm 63 is.

arrangedto engage a guide slot I on the upper end of the cursor; The cursor carries at its lower v endtwo bolts 11 and is, of which thebolt 1a is arranged to run in a guide slot 122 in the arm 63.

' The guide slots HI and I22 are of the same length and arein alignment with one another. A spring 9| is inserted under tension'between the upper endof the arm and the upper portion ofthe, cursor 64. Said spring endeavours tomove the.

cursor towards the upper end of the arm 63., Th

mid-portion of the cursor is curve follower form eccentric 49 of the date v tion of the date plate in a clockwise direction the 56 of the calendar. The outermostprovided with-a2;

projecting to the side, which follower is arranged to rest against the "helici,

plate. By the rota;

arm 83 is endowed with a the eccentric that isloca'tedfurtliest away from the centre, said portion being limited by an arc coaxial with the centre-shaft. Said arc oc- ,cupies a position correspondin with the four 5. slow upward motion, I until the follower 80 has reached that portionof dateflelds. 28, 29, 30", and 3!, and also eccentri the arm 63 is disengaged and quickly swung downwards by the spring 89 whilstfeeding theinonth plate one step. 1 For'the purpose of obtaining a positive locking of the mon Plate 'in the intended positions, the/arm is provided length corresponds withsa id flelds; When j the follower 80 has passed top portion arc of the order to overcome this disadvantagethe arm "as is, according to the invention, provided with 'acarrying pin I50 which is arranged to rest against e the "eccentric 49 duringthe lift motion of, the eccentric, the carrying pin being mounted at the same radial distance from the centre of rotation of the eccentric as the follower 80 providedion the cursor 64 but in such a manner that the car- 'rying pin is in advance of the. followen 'coimted in the direction of rotation of the eccentric;

Through arrangement of," the carrying ,pin the follower goesintoengasement with the eccen- 1tric"only when the" lift motion haslstopped, 'whereupor'r the top portion are of the eccentric .will slidefagainst the follower 80 during those feeding steps of the date indicatingtme'mber that correspond to the last four days of the month,

,ofithe follower I. in relation to the arm 6}. v

The above mentioned cursor is atitslower guide slot .16. on; the last-mentioned arm, which is rotatively mounted on a .pin 15 inserted in the mounting plate 1.5, JPhGm -dEDOIflOI I of the arm jcarries a roller-'1L'which is arranged vto roll on the carn surface ifl'providedfon the disc 22b. This cam surface follows in the'main the curve which is obtaihed 'if mejmontn ms, M;,-M12 and Mir in the'iirstembodiment of the calendar are con-' heated by means of a continuous'curve line.. The

' the, shaft 61 corresponding to 30and 31 days,'and

the/arm 13 as-well asthe cursor are set by meansof said cam surface into positions comesponding to39 and'31 days. A piece correspond-. ing to the j. '..cam" of the month of is, h0W8l/f81'; 'Qlit away 7 from "the annular por-.

tion on th'e' '22b. ('Jonsequeritly, the roller ll, 1 rest against the ca disc 29',

-proximately,.the= sam 'rtical' pla disc ziband,

spam disc-wile shaped irianner asthe-cam disc 29 in the first 'the' rtopfportions ;of which lie at a de -from. the centre-shaft. 6i correj29fdsys, whereasthe periphe oi the mbodiment and time provided with .by means of which the displacement of the month I indicating-gmember andthe restoring of the date plate-are effected in dependence of the position end slidably connected to a setting arm 13 on the "ground'that the bolt 11 is arranged to engage-a cams are thus situated at radial distances from sition. e. Said positionis cam disc, said periphery being limited by a circle, has-a radius corresponding to 28 days according to the "scale indicated above for the cam surface 81. According to the position of the cam disc I 28', thearm'lland the cursor 88 are thus set into a position that corresponds to 28'or 29cdays.

in Figure14, of the'cursorthe follower 8lllbears on the top of the eccentric 48 when the date plate fed 28 stepsiroin its initial position,

i. e. when-the date number 28 is visible ina window provided in the front mounting plate of the calendar, which window may be arranged in accordance with the one'shown in Figure 1. The U 12to 15 will be more'closely described in the I t following; i During the displacement of the month plate 'the date plate is'restored into the initial posilowest position of the cursor corresponds with thirty-one feeding steps of the date plate.

tion which is brought about by means'of anarrangementthat will now be with reference to Figure 14.' v t t e,

l The toothed rack 88 providedat the upper end of the feed arm 88 is arranged to cooperate with two cog-wheels 88, 81 which are concentrically journalled and'rigidly secured to'each other, the toothed rack being arranged to mesh with the smaller cog-wheel 81. The bigger cog-wheel 86 isarranged to meshwith the tooth rim segment 85; which is weldedto the date plate 2| and arranged :coaxially with said plate 21' 'and d1- mensioned insuch a manner that; the am plate by means of therack 83 and the cog-wheels 88, 81, on the swing motion of the arm 83 downwards,

is rotated an angle. corresponding to four date groups. In order to prevent the cog-wheel 88 from engaging the segment 88 every time said segment passes said cog-wheel, the teeth of the cog-wheel arecut away along one third of the circumference of the wheel. While the date plate indicatesthe numbers 28'to"31,"the arm 88 and, consequently, also the toothed rack as well as the cog-wheels 88, 8Iare at rest. During this time the wheel 88 occupies a position, shown-inFigure 14, in which the segmental rack can freely pass the'last -mentioned wheel.

However, as the restoring of the dateplate takes place relatively quickly, there is the risk that the date plate is swung'past the initial position so that it will occupy aimundesired position.

wall, a detent pin secured to the groove wall can freely pass by,'said pin being so placed that the In order to prevent sucha faulty position a segmental plate I" is placed'on the cog-wheel 88 cooperatingwith the segmental rack 85; of the date plate, said plate I41 being arranged to engage, underfree motion; a groove 8 turned in the date plate and being concentrical with the same. The thickness and diameter of theplate I" are equal to the depth and width, respectively,

of the groove the plate I" thereby filling up thoroughly the sectional area of the groove'when the edge,limited by the chord of the plate is placed approximately perpendicularly to the walls of thegroove. If the plate is rotated in such a manner that said edge isparallel to the groove month plate indicates the number Lwhen the detent pin] butts against the plate" I". The gearing 83,88, 81, 85 is'of such a nature that said plate only in that moment when the date'plate has reached the'initial position, obstructs the passage of the, detent pin, whereupon thecogwheel 88 by the toothed rack 88 is turned further into a not looking position in which it stays, until the detent pin has passed the cog-wheel 88 on the next feeding step of the date plate.

v Thedisplacement of the'year plate is effected by means of a gearing. In Figures 14 and 15, the

tooth wheel I08 rigidly secured to the year plate is shown in tooth engagement with a tooth wheel 88 iournalled in the mounting plate It. Thelast-mentioned wheel is turned one tooth pitch every time the month plate and, accordingly. the disc 22b have completed one revolution. This is accomplished by means of a pin 88' inserted in the disc 22b, which pin on the displacement of the year disc engages the toothiwheel 88. The

year disc is locked in the intended'positions by means of a catch spring 88. l

' The function of the calendar shown in Figures as the month of Februaryonly contains 28 days in an ordinary yeanthe date disc is to be turned forward during the displacement of the month disc so: far that it indicates the date number 1.

This restoringpf the date disc is effected by means of the toothed rack 88. The tooth rim segment 88 always occupies when the date plate indicates the ordinal number 28, the position shown in Figure 12. On therotation of .the cog-wheel 88 (Figure 14) in a counterclockwise direction during the downward motion of the toothed rack, the cogs of the wheel mesh with the cogs on the segment that is turned in a clockwise direction. account of the adjusted lengthof the segment, the date plate is brought to its initial position,

, in which it indicates the ordinal number 1. The

year disc occupies a position corresponding to an ordinary year, thus not a leap-year. The roller '14 in this case rests against the circular edge of the cam disc'28'. One twelfth revolution to the right of the roller is to be seen one ofthe three cams of said cam disc. On the displacement of the month disc from the December position to the January position,'the tooth wheel 88 is actuated by the pin 88, the year plate then being turned one step in a clockwise direction. By'this means the roller 14 will in the next month of February. restag'ainst a cam on the cam disc 28', which in its turn influences theposition of the cursor 88 on the arm 88. The follower 88 then occupies in relation'to the arm 88 a position corresponding to a month of 29 days. During the feeding of the month plate from the February position to the March position the roller 14 is raised up' on to that cam on the disc 226 that corresponds to the month of March, by means of which'the arm 18, the cursor 84 as well as the follower take up aposition corresponding to a month of 31 days. p The embodiment, as last described,of the me-J chanical calendar is arranged to be driven either by hand orautomatically under the control of a clockwork. In' the first case a tangent arm is employed, which is rigidly secured to the driving arm 88 cfthe calendar. The tangent arm may naturally be made as an extension of the arm 88.

position.

which on the month displacement influences the v In the present case thetangent arm 39' (Figure 16) is integral with the driving armand arranged ;in"such a manner that it is accessible on the Y underside or the calendar. This placing of the tangent arm is chosen in order to prevent undue displacement of the calendar.

In order to make. it possible, in-such cases hand, which will now be described with reference to Figures 14.1; 16.

By using the adjustable guiding strip I above described one can by. means of the tangent arm 39 displace either the day and date plates simultaneously or the day plate alone'into the desired positions. This latter alternative is attained -"by moving down the foot I26 on'the rod I24 so that the guiding strip I25 will occupy its operative According to the invention, for [the displacement otthe month plate'the following arrangement is employed. A tangent arm I21 jour-' nalled on alpin I39 in themounting plate I5 of the calender is crumped at. its free end and conducted through an arc-formed slot I28. Near the outer end of the arma'slightly bent fiat spring I43 is secured, which acts as a ratchet pawl for the toothed rim 9201' the date indicating member. I21 in a counterclock action of its spring I3I'-,-:

On swinging the tangentarm Ldirection against the the tooth wheel is th'erebyi'ed one step." The journalled end of the arm I21 is provided with an eccentric I29 which is, arranged to go into engagement with a pin I49 secured to the toothed rack 93, on the feeding motion of the arm. As appears from Figure 14, the toothed rack is thereby displacedupwards, by means of which the detent pin I44 of the feed arm 63 goes out of engagement with the ratchet wheel92 which is by this means only. retained by the catch ratchet wheel 92 together with the month plate rigidly secured thereto can thus. by meansot the tangent armLI21 be displaced into a desired position, of the month plate then being the same as at the automatic feeding.

For independent displacement of the year plate a ratchet arrangement I33 to I49 shown'in placement arm,loaded by a Figure 16 is employed. I33 designates a dissupported on the end of the shaft calendar. A pawl I35 actuated by' aspring I31 is provided withatail portion I33 which, whenthe arm I33 rests against a stop pin I32, oes into engagement with a flxed'shoulder I39, I e pawls I33, being thereby brought out of engagement wheel I49 secured to the shaft with the ratchet 3I.- As also the year plate is rigidly secured to the shaft 9|, it can by means of the above-mentioned' ratchet be displaced by hand, the year plate thenbeing'turned in a direction-opposite to its teed direction, during the automatic displacement, which in practice hasfbeen found to be particularly suitable." On this account, it is the resting position of the arm I33 is out of engagement with the ratchet wheel I49. l

In order to impart a smoother run to the calendar members operative on a change, of month a brake apparatus the invention also aims at etooth wheel one; turned, the slot I28 being or such a length that the direction of rotation;

spring I39,rotatively, 9|. of the and designed in the usual manner;

motion of displacement or the month plate as well as the restoring motion of the date plate.

Said brake apparatus will be described with reference to Figuresl'l and 18 in conjunction with a simplified, yet in combination with the brake apparatus thoroughly efiective arrangement for locking the month'plate in due positions after each displacement step. 9 I Said locking is obtained by that means that the iree'end of the pawl 3| is provided with a notch 242 that is arranged to engage a stop pin 24 I which is rigidly mounted on the mounting plate I5 of thecalendar. The notch 242 has such ing member beingthereby prevented from swing-v ing past due positions.

As described in connection with Flgures 14 and 15, the pawl is displaced under continuous motion from itsfinal position back to the initial position in the course of approximately 25days and the'toothed rim 62 is, thereforeyke'pt inlocked position at least 24 to 48 hours-counted from the point or the displacement. In order to make it possible, in spiteot the temporary locking, to displace the date indicating memberby hand whenever wanted the special readiusting tangent I2'I- which is pivoted on the pin "I39 and actuated by the draw spring I3I may stillbe used. The free end or the tangent carries, however, in

this case a pivoted teed finger 243 actuated by a finger after the swing of the spring 244, which tangent I21 a small angle against the action of the-spring 1I3I goes into engagement with the toothed rim 92 which on a complete tangent deflection is displaced one step,'i. e the month plate is moved forward one month. Theeccentric I29 on the end of thejtangent still cooperates with'the pin I provided on the toothed rack 33. The

eccentric I29 is so arranged that at the moment when the tangent finger 243-comes into contact with the rim 92, it has raised the toothedvrack upwards such a distance that the pawl 8I has been brought out of contact, with the pin 24I and been drawn up out of the tooth gap in question, the locking of the toothed rim 92 having thereby ceased.

The teeth on theunder edge of the-rack 93 cooperate,as stated above, with a restoring mechanism actuating the date indicating member. 'According tothepinvention the rack 83 is, however,

provided with cogs alsoon the upper edge, which shaft 231 carrying the spring casing. The last- 1 mentioned shaitwhich is rotatively mounted on the two mounting plates I9,.I5 of the calenda is at the end passing through the rear plate IIi' formed with a squarepin, to which a ratchet wheel 239 is secured (Figures 170. and'l'lb). The shaft 231 can thus be rotated against theaction ot the spring 249 and is locked in the position into which it has been set, by means of a lock" pawl 239 Iournalled in the mounting plateIS' v The spiral spring 249 is so arranged that'it is tensioned on he displacement of the feed arm 93' and the toothed rack 33 from the final position of said members upwards to the initial position during the rotation of the spring casing 239. On the next release of the feed arm 93 the spiral spring 249 is capable of pulling thetoothed rack 93 g downwards the distance necessary for the displacement of the months indicating member. However, in order to cause said displacement motion to take place without throbs or thrusts the toothed rim'of the spring casing 299 is by means of gears 23] to 229 (Figures 1'1 andv 17a) connected to a fan 239 which in previously known manner reduces the displacement motion to a suitable speed. The above-mentioned locking arrangement 299, 229 for the shaft 291 thereby enables the'spiral spring 2l9 of being set to. a suitable initial tension,if so required;

It is important that the run of the clock is not influenced by the driving means necessary for the drive of the calendar and controlled by the clockwork. The above-described driving means, shown in Figures 1, 6 and 7, can suitably be employed in connection with calendars of asrnaller sizeand clockworks, the run of which is controiledby a pendulum. In the following, a driving means capable of being used under all circumstances will be described with reference to Figures 19 to 24, which driving means does not in any way unfavourably influence the run of the clock. though the motive power is taken from the spring which drives the clockwork.-

mounted on the shaft of the hour-hand I11 and arranged to cooperate with a cog-wheel I15 having twice as many cogs. The cog-wheel I16 completes one revolution in the course of twelve hours and, consequently, the cog-wheel. I19 makesone revolution in the course of 24 hours. 'In front of and coaxially with'the last-mentioned co -w iin rotation by the, driving spring 2I4:of the clocka crank-pin disc I14 is mounted. Its crank-pin Informs a bearing point for a connecting rod I19, which is slotted at the lower end so that it forms a fork which grasps the pin 3| provided on the driving arm 99 of the calendar, as shown inFigure 18. A spring "I isinserted under tension between the pin 9| and abolt I12 on the connecting rod.- By this means the driving arm 99 of the calendar can be moved by hand downwards without dislodging the connecting rod.

In Figure 23, 2 I4 designates the driving spring of the clockwork, said spring being with its innermost end 2I6 ri ly secured to a shaft m, whereas the outer end 2I3 of the spring is fixed ina'spring casing 2I5. Said spring casingforms a box provided with bearing sleeves, said box being rotativelymounted on the "shaft I9I and provided with a toothed rim 2I1which meshes with a pinion I92, shown in Figure 29, on a shaft I94,

which may represent the shaft of the hour-hand. The mounting plates of the clockwork, said plates being designated I19, I19, are held together by bolts I99. An extension 2" of the shaft III is by meansof a locking device connected to a cog-wheel 229 which in" its turn is in driving'con nection with a cog-wheel 2| 9 secured to a shaft III by means of a pin 299. To the axle end 2I9 a winding key 2I9 is screwed on. The abovementioned locking device is mounted between the mounting plate I19 and the cog-wheel 229 and is shown'in Figure 22, which represents a section through the outer limiting surface of the mountlug plate J19, 22I designates a ratchet wheel keyed to the ,axle end 2I9, and 223 designates a stop being under the action of a spring 222. ,The -'stop 229 isirotatively mounted on a pin 224,se-

'75 cured to-the cog-wheel 229. By means of this In Figure 19, I19 designates a cog-wheel rigidly arrangement the driving spring of the clock can be tensioned without the wheel 229 then being turned. The crank-pin disc I14 is provided with w an annular central portion 296 which acts at the same time as a separating and strengthening ring 5 for the disc I14 which is rigidly secured to the shaft I99, Figure 23. The last-mentioned shaftcarries, moreover, a cog-wheel I9I fixed by means I of a pin 2I2, as well as the before-mentioned cogwheel I19 which is rotatively mounted on the shaft and provided with a plane lamelliform body. 291

29I, which in looking position engages a tooth -20 on a wheel 292 (Figure 24) welded to the cogwheel I95. A knob 299 is riveted to the spring near thefixed end thereof. Said knob. can move freely in a bore in the mounting plate I19 in such-a manner that under the action of the spring 299 it is held against the plane backside of the cog-wheel I15. The last-mentioned cog-wheel possesses a bore which in the position shown in Figure 23 forms an extension of the bore provided in the plate I18, by means of which the knob 292 '30 can penetrate intothe disc of the cog-wheel I19 so far, that the spring 299 reaches its slack position, in which the stop finger 29I of the spring goes out of engagement with the detent. of the wheel 292. The cog-wheel system I92 to I99 35 ass/friction brake for the-shaft I99, which is put work.

As, however, the driving arm of the calendar at 4 each feeding stroke has to be swung from its uppermost position to the lowest position and back once in 24 hours, the crank-pin disc has to be locked again when it .has made one revolution. For this reason, an axially movable piston 29I fitted into the bore of the cog-wheel I1! is arranged to cooperate partly with the knob 299 of the straight spring'299, and partly with a pin- 295 -rigidly inserted into the crank-pin disc, as

appears from Figure 23. That end of the piston 294 that cooperates with the knob 299, said end being in the following denominated the head, is constructed with a plane butting face and with a greater diameter than the remaining portion of the piston. The other end. :face of the piston forms afrustum-of a cone. The bore in the cogwheel I15 is formed to receive the piston 294, that portion of the bore which is bored out to a greater diameter being of a length thatexceeds the axial dimension of the head to a value corresponding to thedisplacement of the knob 299 on the retrogression of the spring 299 from looking into inoperative position.

The position, shown in Figure 23, of the members 299, 293, 29!, and 295 corresponds to the point of time at which the crank-pin disc has accomplished one feeding revolution, the pin 29' then having pushed the piston 294 in, so that the spring 299 has been moved into locking position. The butting face of the piston head then pin, counted in th ton is greater than the diameter of the knob 20!. Thus. the cog-wheel can-turn a certain distance,

without the knob reaching beyond the fa'ceof the the piston slides out of the 7 the pin 205 is always a certain angle in advance of the knob 203, counted in the direction of rotation of the cog-wheel I15, during the time that elapses between the feeding periods, which is necessary for the function of the driving gear.

Figures25 and 27 show a'modified embodiment of the releasable locking mechanism intended for the driving means. The crank-pin disc I14 is here provided with an eccentric cam or tooth '245which cooperates with a wing 241 attached to a pivoted arm pawl 246. The crank-pin disc is driven in the manner stated above. A cog-wheel 252 keyed to the shaft I of the crank-pin disc is arranged in driving connection I with a fan 263 across a gear constructed in the usual manner and comprising the cog-wheels 253, 254, 255. As appears from Figure 25 the wheel 254 is arranged to rotate in a counterclockwise direction according to the direction of the arrow.

The arm 246 is journalled on the front side of the front mounting-plate I18 of the clockwork on a spindle 248 and is actuated by a draw spring 249 which endeavours to hold the wing 241 against the periphery of the crank-pin disc I14. For this it is convenient to prevent the wing, by means of a stop pin (not shown), from resting under pressure, against the crank-pin disc. The arm 246 is provided with an additional wing 250 forming a cam and disposed in the same vertical plane as the arm itself. The cam surface of said wing cooperates with a pin 25 I inserted in the cogwheel. I15. In accordance with the first embodiment the cog-wheel I15 is in driving connection withthe cog-wheel I16 secured to the shaft of the hour-hand I11. The pin 25I thus completes one revolution in 24 hours. I

The cog-wheel 254 entering into the air friction gear is provided with two pins 258and .259, of which the pin 258 is located nearer the centreof the wheel and somewhat in advance of the other direction of rotation. If the arm 246 occupies the position shown ,in Figure 25, the pin 258 rests against a stop finger 251 formed at the free end of the arm. Because the arm is mounted in front of the disc I18, and the cog-wheel 254 between the mounting plates of the clock-work, the finger of the arm is carried through a window 260 in the front mounting plate. When the arm by means of the pin 25I and the wing 250 is bro" ht to occupy. its uppermost position, the pin 259 impinges on the finger 251. When the pin 25] has passed the wing 250, the arm 246 is moved downwards by the spring 249 so that'the wing going out of engagement with-the pin 259 and will occupy a position behind the pin 258. Thus, the cog-wheel 254 gets free and is put in rotation. When said cog-wheel has made a complete revolution, the crank-pin disc I14 has, however, turned such an angle that the tooth 245 has vpassedthe sector remains V 241 will anew rest against dlsc the top of the ,tooth 245 while the finger 251 is surface of support of the wing 241, and, therefore, the arm 246 is lowereda further distance and the finger 251 is brought out of the path of the pin 258. The disc I14 now accomplishes under the action of the driving spring of the clockwork a complete revolution and returns to the position shown in Figure 25, in which position the pin 258 impinges on the finger 251. The motion of the crankpin disc is by means of the connecting rod I10 transmitted to the driving 56 of the calendar, which armrthen effects the dis placement of the day and date indicating members.

The displacement of the calendar suitably ought to take place at midnight and, therefore, the clockwork in case that its plate only comprises twelve hours, ought to be provided with a 3 hand or other indicatorby 'meansof which one can settle whether the clock indicates day or night hour. Therefore, the present invention also aims at a similar indicator, which will'be described in the following with reference t'o'Fig ures 25-31.

A" first embodiment comprises a hand 21I which across the cog-wheel I16 'as well as cog wheels 265, 266, and 262 is driven by the shaft of the hour-hand I11 under-reduction to half the rotational speed of the hour-hand. The hand 21 I thus makes one revolution in 24 hoursand can bearranged to cooperate with a plate that indicateseither day andnight or the hour-numbers 1 to 24. V A second embodiment, comprises a circular disc 212, which may replace the above-mentioned hand21l. The disc is'divided into two halves of different colours indicating day and night respectiv'ely, which halves alternately, get visible in for instance a window211 provided in the ordinary clock-face, as appears from Figure 29 which shows the disc in one half full size.

Figure 28 shows in principle thetransmission gear that can be employed for the hand 2" as well as for the disc 212. Figure 30 illustrates in one half full size an alternative design of the day and night disc designated with 213. Said disc is divided into eight sectors of equal size alternately light said disc is provided with eight cogs and is locked by means of "a catch spring 219 mounted on a The driving 'wheel'218 is turned one tooth pitch, 1. e. 1/; revolution, every timeone of two pins 28 I and 28I which are inserted in the cog-wheel I15, passes said driving wheel, light and dark sectors then alternately getting visible in the window 211 so as to indicate day and night,

respectively. When the cog-wheel I15, as statedabove, makes one revolution in 24 hours, each visible during a period corresponding approximately to 12 hours. The displacement of thedisc 218 requires about one hour. If required, the disc can, however, in a simple manner be arrangedfor aninstantaneous displacement by connecting the discand thecogand dark. 'A driving wheel 218 on wheel 218 to each other by means of a springy member which is capable of displacing the disc only after a certain tension. The catch sprin then is arranged in cooperation with'the proper Without inconvenience, the calendar can be built, in in the clockwork and the plates of the calendar can,- in this case, be disposed outside or. inside the annular portion marked with numbers, of the dial-plate or the plates of the calendar can be disposed concentrically or ecc'entrically in relation to said portion. The plate rings or more parallel planes or be composed of cy-' lindrical rings, the markings of the plates then being inthe last-mentioned case disposed on the outside oi the rings, for-the purpose or permitting the reading to be performed in the same manner as in a counter or anelectric meter.

I claim: 7 v I 1. A mechanical calendar comprising in comblnation coaxially journalled date number, month and year indicating members, primary driving meansfor setting said date number indicating member, a spring driving device forsetting said month indicating member, means operated from said primary means for accumulating power in said spring, driving device, means con-' trolled by said month and year indicating members i'or'releasing said'springdriving device to operate said month indicating member, and means for restoring said date number indicating member to its initial position upon the release 01' said Spring driving device. a Y

2. A mechanical calendar comprising in combination coaxially journalled date number, month and year indicating members, primary driving means for setting said date number indicating member, a spring driving device, means operated from said driving means for accumulating power in said spring driving device, means for operating said month indicating member by said spring driving device, means for restoring said date number indicating member by the action of said spring driving'device, and means controlled by said month and year indicating membersfor releasing said spring driving device to operate said date number and month indicating members.

3. A mechanical calendar comprising in combination coaxially journalled date number, month andyear indicatingmembers, primary driving means for setting said date 'numberindicating member, a spring driving device for setting said month indicating member, means operated from said primary driving device'for accumulating power in said spring driving device, means for transmitting motion from said spring driving device to said month indicating member, means for restoring said date number indicating member to its initial position, means for transmitting motion from said spring driving deviceto said date number indicating member, and means controlled by said month and year indicating members for, releasing said spring driving device to operate said month indicating member and-said restoring means. i 4. A mechanical calendar comprising in combination coaxially journalled date number, month and year indicating members, primary driving means for setting said date number indicating member, a spring driving device for setting said month indicating member; means operated from said primary driving device for accumulating power in said spring driving device, said spring driving device comprising a'spiral spring the outer end of said spiral spring being keyed'to the date number indicating member and the inner end of said spring being keyed'to a centre pin, means'for restoring said date number indicating member toits initial position, and means controlled by said month and year indicating members for releasing said spring driving device to operate said month indicating member andv and for restoring said date number indicating member .to its initial position, means for transmitting motion from said pivoted arm to said date number indicating member, and means controlled by said monthand year indicating members for releasing said spring loaded pivoted arm to'operate said month indicating member and said restoring means.

6. Amechanical calendar comprising in combination-coaxially joumalled date number, month and year indicating members, primary driving means for setting said date number indicating member, means for restoring said date number indicating member to its initial position, a spring driving device for setting said month indicating member, means operated from said primary driving device for accumulating power in said spring driving device, said spring driving device comprising a spiral spring, the outer end or said spiral spring being keyed to the date number indicating member and the inner end 01' said spring being keyedto a centre pin and a pivoted releasing arm controlled by said month and year indicating members for releasing said spring driving device to operate said month indicating member and said restoring means',said pivoted releasing arm being journalled' on a revolving, disc coaxial with said date number indicating member and normally held in locked position, the peripheric portion oi said disc being adapted tounlock said date number indicating member upon revolving said releasing arm. V 4

7. A mechanical calendar comprising in combination coaxially jo'urnalled date number, month and year indicating members, primarydriving means for setting said date number indicating member, means for restoring said date number indicating member to its initial position, a spring drivingdevice for setting said month indicating member, means operated from said primary'driving device for accumulating power in said spring driving device, said spring driving device consisting in a spiral spring, the outer end of said spiral spring being keyed to the date number indicating member'and'the inner end of said spring being 7 keyed to a centre pin, and a pivoted releasing arm controlled by said month and year indicating members for releasing said springdrlving device to operate said month indicating member and said restoring means, said pivoted releasing arm being provided with a clawshaped portion having 

